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How is ATP synthesized during photosynthesis - Answers

During this process, a phosphateis added to a molecule to cause the formation of ATP.

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How is ATP synthesized during photosynthesis? | Yahoo Answers

Photophosphorylation is the production of ATP using the energy of sunlight. Photophosphorylation is made possible as a result of chemiosmosis. Chemiosmosis is the movement of ions across a selectively permeable membrane, down their concentration gradient. During photosynthesis, light is absorbed by chlorophyll molecules. Electrons within these molecules are then raised to a higher energy state. These electrons then travel through Photosystem II, a chain of electron carriers and Photosystem I. As the electrons travel through the chain of electron carriers, they release energy. This energy is used to pump hydrogen ions across the thylakoid membrane and into the space within the thylakoid. A concentration gradient of hydrogen ions forms within this space. These then move back across the thylakoid membrane, down their concentration gradient through ATP synthase. ATP synthase uses the energy released from the movement of hydrogen ions down their concentration gradient to synthesise ATP from ADP and inorganic phosphate.

During glycolysis, glucose is broken down topyruvic acid, yielding 2 ATP of energy.

As protons flowthrough the ATP synthase, which is a molecular motor that turns, allowingthe enzyme to phosphorylate ADP ATPe) Why is respiration associated with the cell membrane? Respirationinduced electron flow in the membrane is needed to create a PMF.11) NADH is generated in cells that are growing by fermentation andin cells making energy via respiration.

How is ATP used in photosynthesis? - Quora

All the others wouldcontinue for a while, but they wont last for long without ATP synthesis.III.

The active site of the oxygen-evolving enzyme is arranged so that the protons formed during water oxidation are released into the thylakoid lumen. These protons contribute to the electrochemical proton potential. The thylakoid membrane contains aprotein that functions to transport Cl— across the membrane. Proton accumulation in the thylakoid lumen is electrically balanced in large part by Cl— uptake. As a result, thylakoids accumulate HCl and the membrane potential across the membrane is low. The pH inside the lumen during steady-state photosynthesis is about 5.0.

ATP synthesis in chloroplasts is called photophosphory-lation and is similar to oxidative phosphorylation in mitochondria. The light-driven transport of electrons from water to NADP+ is coupled to the translocation of protons from the stroma across the thylakoid membrane (the green, energy-converting membrane) into the lumen. Electron transport from Q— to P700+ is exergonic. Part of the energy released by electron transport is conserved by the formation of an electrochemical proton gradient. The cy-tochrome b6 f complex of chloroplasts functions not only in electron transport, but also in proton translocation.

ATP synthase, photosynthesis Flashcards | Quizlet

The electron cycles from ferredoxin (Fd) to plastocyanin (PC) and back coupling to a proton transport for maximal ATP synthesis.

The extra reducingpower generated during respiration also means more NADH for biosynthesisand growth.

a) Which diagram shows aerobic respiration?

Glyceraldehyde 3-phosphate is a sugar phosphate and may be readily converted within chloroplasts to many sugars and the glucose polymer starch. Some of the glyc-eraldehyde 3-phosphate is used in a complex series of reactions to regenerate the five-carbon acceptor of CO2, ribulose 1,5-bisphosphate. In the process, one phosphate is cleaved from one of the sugar phosphate intermediates. Thus, ribulose 5-phosphate, the product of the cycle, must be phosphorylated by using ATP as the phosphoryl donor. As a consequence, three ATP and two NADPH are required for each CO2 taken up.

Photosynthesis is not simply a reversal of oxidative degradation of carbohydrates and oxidative phosphorylation in mitochondria.
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  • Electron transport chain and ATP synthesis (thylakoid ..

    The proton gradient is coupled to H+-ATPases similar to those in mitochondria synthesizing ATP from ADP + Pi.

  • How do we know the O 2 is derived from H 2 O during photosynthesis

    He explained the complete mechanism of ATP synthesis within the chloroplasts during the process of photosynthesis

  • Some organisms do not release O2 during photosynthesis

    Likewise, oxygen produced during photosynthesis can only pass out of the leaf through the opened stomata

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During photosynthesis solar energy is trapped by ..

In respiration energy is released fromsugars when electrons associated with hydrogen are transported to oxygen (theelectron acceptor), and water is formed as a byproduct. The mitochondriause the energy released in this oxidation in order to synthesize ATP. Inphotosynthesis, the electron flow is reversed, the water is split (not formed),and the electrons are transferred from the water to CO2 and in theprocess the energy is used to reduce the CO2 into sugar. Inrespiration the energy yield is 686 kcal per mole of glucose oxidized to CO2,while photosynthesis requires 686 kcal of energy to boost the electrons from thewater to their high-energy perches in the reduced sugar -- light provides thisenergy.

During photosynthesis, letter X marks the spot for

How the electromagnetic energy of light is converted to chemical energy in the form of reduced organic molecules is complex. Nonetheless, the first principles of energy conservation and conversions in photosynthesis may be simply depicted. All higher photosynthetic organisms contain two forms of the green pigment chlorophyll. More than 99% of the chlorophyll in chloroplasts, the organelles in which photosynthesis takes place, functions in a passive, purely physical manner. Organized in specific pigment-protein complexes within the photosynthetic membrane, these chlorophylls absorb visible light and transfer excitation energy to nearby chlorophylls with efficiencies very close to 100%. In a real sense, more than 99% of the chlorophylls function only to gather light and as such they are often referred to as light-harvesting chlorophylls.

and can link that to chemiosmotic synthesis of ATP.

A series of metabolic pathways (the Krebs cycle and others) in the mitochondria result in thefurther breaking of chemical bonds and the liberation of ATP.

potential to make ATP during ..

It is the PMF, not electronsfrom the TCA cycle or a high-energy phosphorylated compound, which is usedto synthesize ATP.] The TCA cycle is linked to oxidative phosphorylationin that it provides the reducing power (electrons) that flow in theETS to form PMF.

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